Safety device for die-sets



Feb. 3, 1953 N. M. MARSILIUS SAFETY DEVICE FOR DIE-SETS 2 SHEETS-SHEET 1 Filed 001;. 12, 1950 J1 E INVENTOR NEWMAN M MARSILIUS A TTORNEY Patented Feb. 3, 1953 UNITED STATES FTE ZNT QFFlCE SAFETY DEVICE FOR DIE-SETS Newman M. Marsilius, Trumbull, Conn, assignor to The Producto Machine Company, Bridgeport, Conn, a corporation of Connecticut Application October 12, 1950, Serial No. 189,713

4 Claims. (01. 164-118) This invention relates to new and useful improvements in die-sets and has relation to certain features of construction.

An object of the invention is to provide a dieset including accurate means for positively limiting the approach of the punch holder toward the bed.

Another object is to provide in a die-set a simple and reliable means for removahly mounting a guide bushing in a punch holder.

Another object is to provide in a die-set a simple and reliable mean for removably securing the guide pins in the bed.

Other objects and advantages of the invention will become apparent from a consideration of the following detailed description taken in connection with the accompanying drawings wherein a satisfactory embodiment of the invention is shown. However, it is to be understood that the invention is not limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims.

In the drawings:

Fig. 1 is a front elevational view showing a die-set made in accordance with the invention;

Fig. 2 is a top plan view thereof;

Fig. 3 is a horizontal sectional view taken along the plane of the line 33 of Fig. 1;

Fig. 4 is a similar view but taken along the plane of the line 4--4 of Fig. 1;

Fig. 5 is a vertical sectional view taken along the plane of the line 55 of Fig. l; and

Fig. dis a plan view of a locking ring employed for securing the removal bushing and the removable guide pin to the punch holder and bed, respectively.

Referring in detail to the drawings, at It is generally indicated a die-set constructed in accordance with the invention and comprising a bed II and a punch holder I2. In the present disclosure, the invention is illustrated as incorporated in a die-set employing but two guide pins although it will be understood a the description proceeds that the invention is equally applicable to die-sets of the type employing more than two guide pins.

The bed I I is shown as having a pair of openings l3 extending therethrough and which openings at their lower end enter annular recesses I4. Guide pins I5 and it are mounted by the bed plate II. The lower end portions of the guide pins extend through the passage or openings I3 and the relative diameters of the openings and pins are such that the pins have a 2 tight fit. Then the lower end portions of the ins immediately within the recesses I4 have annular grooves ll formed therein.

Separate spring rings 18 are located in the recesse l4 and partially enter the annular grooves ll whereby to prevent withdrawal of the pins or outward movement of the pins through the bed H. One of the rings I8 is shown alone in Fig. 6 and it is noted that the same is made up of substantially fiat spring stock having outwardly disposed radial enlargements it and lit at its ends and which enlargement are shown as provided with perforations 2i.

A suitable tool, such as a pointed plier-type tool, may have its ends inserted into the perforaticns 2| and may be used to expand the split ring by forcing its end portions l9 and 2t from one another. Then the ring is passed over the lower end of the pin it or it until it is aligned with the groove ll therein whereupon the tool is released or manipulated to bring" the ring ends !9 and 20 toward one another so that the ring springs partially into the groove ll. In this condition, the ring overlaps the bottom wall of the recess M whereby the pin is secured in place.

Somewhat similarl the punch holder i2 has openings 22 therethrough and which openings at their upper ends terminate in recesses 23 opening through the uppersuriace of the punch holder. Having a snug fit in each of the openings 22 are bushings 24 of an internal diameter to slidably receive the guide pins i5 and it. At their inner ends, the bushings 2 are of enlarged diameter having hcad like portions 25 and then at their outer ends within the recesses 23, the bushings are provided with annular grooves 26L Additional split rings I?- are received in the recesses 23 and partially enter the grooves 25 in the bushings and overlap the bottom walls of the recesses 23 in Fig. 5) whereby the bushings are secured in place.

With the described construction, it will be seen that the guide pins and the bushings are removably mounted in the bed and punch holder, respectively, of the die set. To remove the bush ing or the pin, the ring it securing the element is expanded to remove the ring from the groove of the element, and in fact, to clear the element and then the ring may be lifted out of place so it is no longer securing the element. Expansion of the ring may. be through the use of a plier-type tool as mentioned above or the use of a screw driver or the like entered into the split between the enlarged end portions i9 and 20 of the ring. In any event, the securing rings are exposed location, preventing any possibility of excessive movement of the punch holder toward the bed. In the present embodiment, the means acting as stated will prevent crushing of the hands of an operator or the like which accidentally or thoughtlessly may be between the punch holder and bed and the means also serves as a block or shield occupying certain space to preventinserting of the hands or fingers of an operator. Also distortion to the surfacesimmediately surrounding the guide pins is prevented in the event of dropping of the punch holder upon'the bed, or of dropping the punch holder while it is removed from the bed.

The stop means associated with the respective guide pins, as mentioned, are all alike and adetailed description of one applies to both and thus the same reference characters have been applied to the parts. Generally, in the present disclosure, the stop means associated with guide pin I5 is designated 2'! and the stop means associated with the guide pin I6 is designated 23.

Each stop means comprises an upper part 29 secured to the punch holder I2 and a lower part 39 secured to the bed I I. Part 29 comprises a plate-like portion 3| having a fiat upper surface 32 disposed against the underside of the punch holder I2. This portion 3| has an opening 33 therethrough and through which the bushing 24 passes and in which the said bushing has a snug fit. Thus, in making the assembly, the part 29 is first positioned. Then the bushing is slipped through the part and secured in place with the head '25 of the bushing overlying the underside of that portion of the plate-like part3I immediately'about the bushing.

Whenmouutin'g the part on the punch holder, the part is located by the dowels '34 and is then fastened in place by the machine screws 35. In addition to'the'plate-like portion '3I, part 29 includes a generally .L-shaped wall portion 36 .depending from the plate-like portion :3I .and ex tending about two sides .of the associated guide pin :in laterally spaced relation thereto. The lower face or edge 31 of the .L-shaped wall'por tion 36 is machined oif whereby it is 11% and whereby the portion "is accurate as to length.

With the described construction it will be clear that the bushing 24 may be removed without detaching the part 29 from the punch holder. However, it is also pointed out that since the part is located by the dowels 34 the part may be removed and when reapplied will occupy its same position. This is of significance since at times it may be necessary to remove the parts for the purpose of grinding olT their ends 31..

Stop device part also includes a plate-like portion 38 having a flat underside 39. Portion 39 has an opening 40 therethrough and through which a guide pin passes and the part has its flat surface 39 against the upper surface portion of the bed I I about the guide pin. Part 3 is located by dowels 4| and is secured in place by machine screws 42.

In addition to the plate-like portion '38, the part 30 includes an upstanding L-shaped wall portion 43 having a flat machined upper end 44 located in aligned opposed relation to the fiat machined lower end surface 3'! of the L-shaped portion 36 of part 29. Thus, the L-shaped wall portion 43 of part 30 extends about two sides of the associated guide pin in laterally spaced relation thereto. Clearly, the parts 29 .and 30 of stop device 21, together with the corresponding parts of stop device 28, close the corner portions of the die-set reducing the exposed areas into which the fingers or a hand might be inserted.

The present stop device is particularly useful in a die-set wherein form dies are being used. The stop device positively limits movements of the punch holder toward the bed of the die-set and as the punch holder is moved towards the die-set it is brought to a positive stop by the engagement of the flat machined lower edge surfaces 3! of the parts 29 with the flat machined upper edge surfaces 44 of the parts 30. As the wall portions .36 and 43 are laterally "spaced from the guide pin, the surfaces of the bearing head 25 and the plate-like portion 38 immediately surrounding the guide pin are protected from distortion such as might result from impact when the punch holder is dropped upon the bed. As the end surface of the wall portion 36 is below the bearing head 25, the latter is also protected from impact when the punch holder is removed from the guide pins of the bed.

stop means of the invention "is positive an The parts 29 and 30 are of identical construction with the exception that the openingthroug'h the part 29 is of slightly larger diameter whereby to accommodate the bushing 24. Since the bushing '24 is removable as above described, it

will be seen that the parts 29 and30 of the stop devices may be removed from the punch holder and bed whereby 'togive better access to the tools for grinding or the like. In addition, the stop devices are manufactured in various lengths for use with various dies. Devices of substantially the proper length then have the ends of their L-shaped wall portions groundto provide the exact length desired whereby they are of the proper length and positively stop movement of the punch holder toward the bed of the die-set at exactly the proper point.

Additionally, these stop devices may have their end surfaces 3! and 44 ground off to have the devices of the proper size as a die -wears. The

accurate and does not involve the adjustment of any screws or the like. Additionally, as suggested above, the L-shaped "wall portions guard the corners of "the die-set and this is a safety feature as well as the absence of any adjustable screws or the like which the operator :may 'attempt to adjust and in doing so have his hand crushed.

Having thus set forth tion, what I claimis:

'1. In a die-set, a horizontal bed and a horizontal punch holder above said bed, a'pair of vertically disposed guide pins mounted by said bed and along which said punch holder may move toward and from said bed, a positive stop device associated with each of said guide pins including a pair of parts of which one is on said punch holder and the other on said bed, said parts including oppositely extending vertically aligned wall portions laterally spaced from the pin ssociated therewith and having'opposing end surfaces lying in parallel horizontal planes for contact one with the other as said punch holder is moved toward said bed to positively limit said the nature of my invenmovement and support said punch holder in vertically spaced relation to said bed, and means removably securing said parts to said punch holder and bed respectively.

2. The invention as defined in claim 1, further characterized in that said wall portions are of Lshape in horizontal cross-section and are disposed laterally outwardly of the guide pin associated therewith.

3. In a die-set, a horizontal bed and a horizontal punch holder above said bed, a pair of vertically disposed guide pins mounted by said bed and along which said unch holder may move toward and from said bed, a positive stop device associated with each of said guide pins including a pair of parts each comprising a plate-like portion having an opening which receives the guide pin associated therewith, the plate-like portion of one part being disposed against the under side of the punch holder and the plate-like portion of the other part being disposed against the upper side of the bed, means removably securing said plate-like portions to said punch holder and bed respectively, a vertical wall portion on each of said late-like portions in laterally paced relation to said associated guide pin, said wall portions being disposed in vertically aligned and opposed relation one to the other and having opposed end surfaces lying in parallel horizontal planes for contact one with the other as said punch holder is moved toward said bed to positively limit said movement and support said punch holder in vertically spaced relation to said bed.

4. In a die-set, a horizontal bed and a horizontal punch holder above said bed, a pair of vertically disposed guide pins mounted by said bed, a pair of bushings mounted by said punch holder and extending therethrough and respectively slidable along said guide pins toward and from said bed, a positive stop device associated with each of said guide pins including a pair of parts each comprising a plate-like portion having an opening which receives the guide pin associated therewith, the plate-like portion of one part being disposed against the under side of the punch holder and the plate-like portion of the other part being disposed against the upper side of the bed, means removably securing said platelike portions to said punch holder and bed respectively, said bushings being respectively engaged through said openings of said plate-like portions of said parts mounted on said punch holder and each having a laterally extended head portion overlying the under side of said platelike portion, a vertical wall portion on each of said plate-like portions in laterally spaced relation to said associated guide pin, said wall portions being disposed in vertically aligned and opposed relation one to the other and having opposed end surfaces lying in parallel horizontal planes for contact one with the other as said punch holder i moved toward said bed to positively limit said movement and support said punch holder in vertically spaced relation to said bed, the end surface of said part connected to said punch holder being at a greater vertical distance from the under side of said punch holder than said head of said bushing, and means removably securing said bushings to said punch holder whereby said parts secured to said punch holder are removable therefrom on removal of said bushings.

NEWMAN M. MARSILIUS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,161,078 Slade Nov. 23, 1915 2,317,889 Danneman Apr. 27, 1943 2,356,387 Danneman Aug. 22, 1944 

